US2592368A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gelatine silver halide emulsion layer containing a dihydroxy diphenyl tanning developing agent
Assignee: Eastman Kodak Co
•
Filing: 1947-11-04
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Granted: 1952-04-08
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Expires: 1967-11-04
Abstract
No abstract record available.
Inventors
- 👤 Edward C Yackel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:48
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/06; G03B; G03B15/00; G03C; G03C5/00; G03C5/26; G03C5/29; G03C5/315; Y; Y10; Y10S; Y10S101/00; Y10S101/29
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
35 words
A PHOTOGRAPHIC EMULSION LAYER COMPRISING A SUBSTANTIALLY UNHARDENED GELATIN VEHICLE AND DISPERSED IN SAID VEHICLE A SILVER HALIDE AND A TANNING DEVELOPING AGENT OF THE CLASS CONSISTING OF 2,3-DIHYDROXY DIPHENYL, 2,5-DIHYDROXY DIPHENYL, AND 3,4-DIHYDROXY DIPHENYL.
Claim 2
Dependent Claim
35 words
A PHOTOGRAPHIC EMULSION LAYER COMPRISING A SUBSTANTIALLY UNHARDENED GELATIN VEHICLE AND DISPERSED IN SAID VEHICLE A SILVER HALIDE AND A TANNING DEVELOPING AGENT OF THE CLASS CONSISTING OF 2,3-DIHYDROXY DIPHENYL, 2,5-DIHYDROXY DIPHENYL, AND 3,4-DIHYDROXY DIPHENYL.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-04-08 | 1955-10-08 | 1956-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-08 | 1959-10-08 | 1960-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-08 | 1963-10-08 | 1964-04-08 | $7700.00 | Window Closed / Lapsed |